聚羧酸系减水剂引气方式对混凝土性能的影响

摘要

The influence of three air entraining manners I. E. Partially defoaming,locally defoaming and first defoaming then air entraining on the air-void characteristics in hardened concrete, such as stability, spacing factor and mean air void diameter was investigated. The mechanical properties and durability of air entrained concrete by different air entraining agents were also studied. The results show that air content can be adjusted and optimum quality of air voids can be obtained by means of the third manner by selecting the appropriative air entraining agents for polycarboxylate-type water reducers.%探讨了部分消泡、局部消泡、先消后引这3种引气方式对混凝土含气量稳定性、气泡间距系数、平均气泡径等参数及混凝土力学性能和耐久性的影响.结果表明,采用“先消后引”的引气方式并选用聚羧酸专用引气剂,可以调整混凝土含气量,使含气量稳定、气泡间距系数大、平均气泡孔径小.